Valve.



. GJJALEN.

VALVE. APPLICATION FILED MAY 23, 1908.

Patented Apr. 5, 1910 Cad z/e566 ,g. a 'ywzamw UNITED STATES PATENT ()FFICE. et rsrar-DALEN, or STOCKHOLM, SWE DEN, assIeNoR, BY MESNE AssIGNnEN'rs, 'ro AMERICAN GAsAcoUiaULA'roR COMPANY, A CORPORATION on NEW JERSEY.

VALVE.

' Specification of Letters Patent.

Patented Apr. 15, 1910.

Application filed m as, 1908. 2 Serial No. 434,656.

To all "it may comemf Be it known that I, GUSTAF DALiiN, en-' gineer, subject of Sweden, residing at Knng stensgatan 62, "Stockholm, Sweden, have.

invented new and useful Improvements in Valves, of which the following is a specification.

The resent invention refers to a valve, in

which eakage around the valve spindle is prevented wlthout' using a packing box for. this purpose, such' pac ing boxes, as commonly known, being unreliable in their function and requiring repeated adjustments. For this purpose the valve consists of a flexible membrane, which is, arranged above a valve seat and is pressed against said seat'forclosin the valve by screwing down a screw spin le, abutting against the For opening the valve said screw spindle is screwed back, whereby the membrane retakes'its. original position owing to its flexibility and owing to the pressure of the fluid fiowingthrough the valve, Said fluid flows through the valve casing only on one side of the membrane, which is tightly pressed between tightening surfaces 0 the valve casing and a screw plug.

For making the invention fully under-.

stood reference is made to the drawing, showing a valve of this kind in longitudinal section.

1 indicates the valve seat of the valve casin 2, and 3 indicates'a boring, openin in va ve seat and serving as inlet for the uid inquestion. Above said valve seat 1 a flexible' membrane 4 is tightly pressed, between an annular surface 6 of the valve casing and the end surface of a screw said surface 6' and the membrane if neces sary. A screw spindle 8 is screwed through a threaded central hole of the screw plug 5 plug 5, whereby a lightening ring 7 may be inserted between membrane, whereby the block 4' is omitted. I

10 indicates theoutlet, opening in an annular space 11, arranged concentrically to the valve seat 1.

Thedrawing illustrates the 0 en position of the valve, whereby the flui is flowing through the inlet 3, the valve seat 1', and the annular space 11 to the outlet 10. The space 11 is tightly shut off from the threadings of the screw plug 5 and of the screw spindle 8' owing to the tightening at 6, 7, so that leak-,

age through said threadings is prevented.

For closing the valve, the screw s indle 8 is screwed down, whereby the mem rane 4 is pressed a ainst the seat 1.

What claim is In combination with a valve casing having a valve seat and an inlet delivering therethrough, said casing having an annular space arranged around said seat and an out.- let communicating with said space, said casinghaving an annular membrane. support surrounding said space,-a tightenin ring on said support, a membrane dispose on said ring and supported thereby above and out of contact with said seat, a screw plug havin threaded engagement with said casing an provided with an annular shoulder engaging said membrane and holding the same in engagement' with said ring, and a member engaging said membrane to force the same upon said seat to close the valve said memher having a membrane enfagmg surface substantiallyequal to theinlet the remainin surface receding upwardly and lateral y therefrom, substan' tially as and for the pur ose set faith.

In testimon whereof in presence 0 two witnesses.

' GUSTAF DALEN,

' Witnesses:

WALDEMAR' BOMAN, HJALMAR PETEERSTROM iameter of its.

aflixmy signature. 

